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Topic: Borane


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In the News (Wed 30 May 12)

  
  Borane Chemistry : Diborane and Borane Reagents, Borane reactions
Borane Chemistry : Diborane and Borane Reagents, Borane reactions
Special care is necessary when using diborane due to its high sensitivity to air, to moisture, its high toxicity and its explosiveness.
H6) is produced and may be transformed into various borane agents for special need in terms of reactivity and selectivilty.
www.novasep.com /technologies/Borane-Chemistry.asp   (97 words)

  
  Research
These borane monomers as they are called (boron alkyls) possess chemistry that is similar to their plain alkane counterparts, therefore not significantly altering the properties of the material.
Borane monomers also possess an added advantage in that they can be polymerized using a Ziegler-Natta route without the problems of catalyst poisoning that were encountered in polymerizing "pre-functionalized" monomers.
The borane groups on the polyolefin are first converted to hydroxyl groups which then undergo a reaction with caprolactone to form condensation polymer grafts.
www.ems.psu.edu /~chung/research.html   (700 words)

  
 [No title]   (Site not responding. Last check: 2007-10-01)
Borane began to build his wealth in the 1970's, when he headed the Douglas police, fire, animal control and weights and measures departments, with the catch-all title of safety director.
Borane was not charged in the inquiry but resigned his posts in 1979 as the investigation advanced.
Borane is immune from prosecution for his decisions.
www.jail4judges.org /JNJ_Library/2000/corrupt/Borane.htm   (1043 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: 2007-10-01)
A borane is an inorganic chemical compound of boron and hydrogen.
The boranes remained a laboratory curiosity until World War Two, where there was some interest in using uranium borohydride as a volatile uranium compound for isotope separation.
Boranes are generally at least somewhat toxic; the exposure limit for diborane is 100 parts per billion.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=borane   (569 words)

  
 [PRISONACT] corAZ01-Judge charged with drug trafficking, money laundering
Borane rose from Douglas town patrolman and police chief to magistrate, justice of the peace and power broker, prosecutors and his former associates said.
Borane began to build his wealth in the 1970's, when he headed the Douglas police, fire, animal control and weights and measures departments, with the catch-all title of safety director.
Borane was not charged in the inquiry but resigned his posts in 1979 as the investigation advanced.
www.prisonactivist.org /pipermail/prisonact-list/2000-February/002624.html   (1222 words)

  
 The Nobel Prize in Chemistry 1976 - Presentation Speech
The name borane is the collective term for compounds of hydrogen with boron, the latter element forming part of among other things boric acid and borax.
A great number of boranes and related compounds are known, and it is this whole group of substances which has been studied by Lipscomb.
Stock had found borane molecules that, for example, consisted of in one case two boron and six hydrogen atoms and in another case ten boron and fourteen hydrogen atoms.
nobelprize.org /nobel_prizes/chemistry/laureates/1976/presentation-speech.html   (813 words)

  
 Borane-sulfide hydroboration agents - Patent 5567849
Borane adducts were readily prepared by saturating the neat sulfide with diborane at 0.degree.
Borane bis(2-methoxyethyl) sulfide (5.0 ml, 30 mmol) was dissolved in dichloromethane (30 ml) and 1-octene (10.10 g, 90 mmol) was added dropwise with cooling to keep the temperature at 20.degree.-25.degree.
The properties of representative borane alkyl and ether sulfides of the present invention and commercial prior art agents are summarized in Tables I and II.
www.freepatentsonline.com /5567849.html   (3591 words)

  
 Borane Reagents
There is a wide range of boranes: Decaborane for example is not as reactive as diborane and is used as reducing agent too.
The most interesting application is as a borane source for oxazeborolidine catalyzed asymmetric reductions of ketones (Corey-Bakshi-Shibata Reduction).
The catalytic asymmetric borane reduction of both electron-deficient and electron-rich ketones was achieved with high enantioselectivity with a C
www.organic-chemistry.org /chemicals/reductions/boranes.shtm   (402 words)

  
 The Harvard Crimson :: News :: Nobel Prize Winner Lipscomb Speaks on Borane Discoveries
The boranes have proved especially effective in treating brain tumors, he said.
The borane discoveries have also led to advancements in color photography and the development of a new synthetic rubber material that "shows a constant viscosity over a particularly wide range of temperatures," Lipscomb said.
Lipscomb said that studies done by Linus Pauling, a double Nobel prize-winner, first interested him in borane chemistry because "everything he said was wrong," but added that all early theories about borane structures were simplistic and incorrect.
www.thecrimson.com /article.aspx?ref=151009   (273 words)

  
 FSD: Chemical & Materials Sciences Division: Highlights: Hydrogen Storage in Ammonia Borane   (Site not responding. Last check: 2007-10-01)
Ammonia borane, is a solid at room temperature composed of 19 weight percent hydrogen.
Unfortunately, the bulk ammonia borane may release hydrogen too slowly for use as a hydrogen storage media for an automobile.
They have observed when ammonia borane is put into the pores of a mesoporous silica, with a pore diameter of 6.5 nanometer, the rate of H
www.pnl.gov /cmsd/highlights/200505hydrogen.stm   (272 words)

  
 Sierra Vista Herald | The Bisbee Daily Review
And Fox's comments Tuesday in Arizona left a variety of impressions with area residents who either saw him or, in the case of one person, was on his way to protest the visit.
Borane, a supporter of a new program to legally allow Mexicans and other immigrants to come into the United States to fill jobs Americans will not do, said he was troubled by Fox's lack of how Mexico would like to see the program developed.
Initially, Borane was to speak for the Arizona border mayors at the private meeting with Fox, but he said he let the Nogales, Ariz., Mayor Mario Lopez do most of the talking.
www.svherald.com /articles/2003/11/06/news/news4.txt   (816 words)

  
 The Daily Dispatch
Borane said he had this violence in mind when he drafted the resolution in November of 2002.
He saw the build up of militia groups and citizens' patrol groups, whose sole purpose is to stop migrants from crossing the border, even if it means stopping them a gun point, he said.
Borane said that people like Nethercott, who is a twice convicted felon, who has been charged with pistol whipping two El Salvadoran migrants in Texas, is a danger to the community.
www.douglasdispatch.com /articles/2004/09/18/news/news1.txt   (373 words)

  
 Hawthorne Lab - Introduction
While borane and hydrocarbon derivatives share many related structural features and functions, borane species are apparently stable in the presence of enzyme systems which have supported the evolution of life (at least on this planet) and they appear, at this time, to be inert to enzymatic degradation reactions.
Biomedical polyhedral borane chemistry is a new field which combines polyhedral borane chemistry with organic chemistry and aspects of biomedicine.
Thus far, "camouflaged carboranes and polyhedral boranes" are comprised of derivatives of the three isomers of carboranes (1,2- or ortho-, 1,7- or meta-, and 1,12- or para-carborane) and the icosahedral B
www.chem.ucla.edu /dept/Faculty/hawthorne/introduction/intro0.htm   (1427 words)

  
 IngentaConnect Phosphinous Acid-Boranes
Borane complexes of trivalent phosphorus compounds have attracted a continuously growing interest over the past four decades.
Their remarkable air and configurational stability combined with a relative easiness of fully stereoretentive removal of the protecting borane moiety quickly made them reagents of choice for the elaboration of phosphine structures especially suited for the preparation of chiral phosphine ligands.
Details of the studies of the reactions of secondary phosphine oxides with borane reagents that were rudimentary to the development of general synthetic routes to phosphinous acid-boranes will also be presented.
www.ingentaconnect.com /search/article?title=phosphites&title_type=tka&year_from=1998&year_to=2005&database=1&pageSize=20&index=16   (310 words)

  
 Fused polyhedron borane dianion
A polyhedral borane cluster consists essentially of a fused polyhedron including an open decaborane cage fused to a closed dodecaborane cluster wherein borane atoms are not an integral part of the cluster vertices.
The polyhedral borane cluster can be contained within a biomolecule for use as a neutron capture reagent.
Polyhedral группа borane состоит необходимо сплавленного полиэдрона включая открытую клетку decaborane сплавленную к закрытой группе dodecaborane при котором атомы borane не будут неотъемлемаяа часть вершин группы.
www.patentalert.com /docs/000/z00061900.shtml   (146 words)

  
 Pima student wins $1,000 in national essay contest | www.azstarnet.com ®
Brittany Borane, a Vail resident and Pima Community College student, has won the $1,000 grand prize in a nationwide essay contest.
Borane wrote about how her experience as a preschool teacher showed her that she wants to work with children as a career.
Borane said she is "very torn" between her love of writing and her love of working with children.
www.azstarnet.com /sn/printDS/54236   (321 words)

  
 Organoborane Summary
The parent borane, diborane is classified in organic chemistry as a strong electrophile and reacts rapidly to alkenes in a process called hydroboration.
Although diborane as a pure compound is a dimer, BH forms a 1:1 complex with oxygen in for instance THF.
In an ordinary electrophilic addition reaction the Markovnikov's rule determines regioselectivity but with boranes the mode of action is the exact opposite.
www.bookrags.com /Organoborane   (859 words)

  
 It:h3nbh3 - ChemWiki
Ammonia Borane is a coordination compound which has been recently discovered to be a good source of hydrogen for future hydrogen-fuelled engines.
Although ammonia borane is isoelectronic with ethane, ammonia borane is a solid while ethane is a gas with m.p.
Ammonia Borane is not made on an industrial scale and so the cost depends on the synthesis technique and processes.
www.ch.ic.ac.uk /wiki/index.php/It:h3nbh3   (535 words)

  
 Borane
Borane sind Borwasserstoffverbindungen (Borhydride) über die als erstes Alfred Stock 1912 veröffentlichte, und deren Derivate.
Das sich danach entwickelnde Gebiet der Chemie der Borane und der verwandten Carbaborane ist eines der wichtigsten Entwicklungsfelder in der anorganischen Chemie.
William Lipscomb erhielt für seine Arbeiten über Borane und Carbaborane 1976 den Nobelpreis für Chemie.
www.xn--enzyklopdie-s8a.de /Borane.html   (175 words)

  
 Boron Page
The difference in the transition states are based on the approach of the borane group.
This transition state was the original pathway of interest because the transfer showed evidence of a free borane in the reaction.
This geometry was also indicative of a non-inversion mode on borane transfer.
www.uwm.edu /~tholme/Research/boron_page.htm   (288 words)

  
 In The News Today
For Douglas Mayor Ray Borane, the connection between his border community and that of its larger border neighbor, the Sonoran city of Agua Prieta, as well as the entire state of Sonora, is critical to the Arizona city's survival.
Borane said he was told by the Sonoran governor that a highway connecting Nogales with Agua Prieta is almost complete and that will mean more truck traffic will divert to the U.S. Custom Service's Douglas Port of Entry reducing the bottleneck currently being experienced at Nogales.
Borane believes his community has to take advantage of all economic possibilities flowing north out of Mexico.
members.tripod.com /~cochiseguardian/NEWS/hullmexicanties010221.html   (738 words)

  
 Sierra Vista Herald | The Bisbee Daily Review
MEXICO CITY — The mayor of Douglas, Ray Borane, was among the Arizona civic and business leaders who met with Mexican President Felipe Calderon at his residence on Friday.
Borane said Public Security Secretary Genaro Garcia told him and Gov. Janet Napolitano that Mexico’s federal government is planning to establish two law enforcement bases in Agua Prieta, Sonora, that will deal with border-related matters.
In addition, Garcia told Borane that the federal officers would not allow protesters to blockade the port of entry into Douglas as a tactic in political protests.
www.svherald.com /articles/2007/02/11/local_news/news4.txt   (457 words)

  
 American Scientist Online - Filling up with Hydrogen
A third of the hydrogen is released at about 110 degrees, a second third at about 155 degrees (at which point ammonia borane is a liquid) and the final third at a higher temperature still, more than 500 degrees.
Autrey's team infused ammonia borane into a nanometer-scale scaffolding of silica, a type of material often used as a substrate for catalysts because it provides an enormous surface area for reactions.
And T.-Raissi stresses that being able to reconstitute the ammonia borane is necessary for this scheme to be economical for anything but niche applications.
www.americanscientist.org /template/AssetDetail/assetid/45942   (921 words)

  
 Unhappy Arizona Mayor
With a new guest worker program, costs could be kept down while allowing legal immigrants to cross into the United States to fill jobs Americans do not want to do and would allow the then legal immigrants to be paid better and allow their children to go to school, he said.
He pointed out that even children who are born in the United States to illegal immigrants, and therefore are citizens of the country, do not attend school because their parents are afraid of being found.
It was a laugh,” Borane said, adding he was not invited to meet with Ashcroft.
www.dslextreme.com /users/surferslim/unhappy.html   (531 words)

  
 Fuel Cell Works Supplemental News Page
For its relatively light weight, ammonia borane contains a large fraction of hydrogen that can be released as a gas — and it is a stable solid at room temperature.
The experiments and calculations both indicate that the stability of ammonia borane relates to its purity and that it can remain stable for many days or longer in high temperatures.
They have observed when ammonia borane is put into the pores of a mesoporous silica, with a pore diameter of 6.5 nanometer, the rate of H2 release increased by nearly 2 orders of magnitude.
www.fuelcellsworks.com /Supppage5969.html   (552 words)

  
 Fuel Cell Works Supplemental News Page
A third of the hydrogen is released at about 110 degrees, a second third at about 155 degrees (at which point ammonia borane is a liquid) and the final third at a higher temperature still, more than 500 degrees.
Autrey's team infused ammonia borane into a nanometer-scale scaffolding of silica, a type of material often used as a substrate for catalysts because it provides an enormous surface area for reactions.
And T.-Raissi stresses that being able to reconstitute the ammonia borane is necessary for this scheme to be economical for anything but niche applications.
www.fuelcellsworks.com /Supppage3222.html   (923 words)

  
 Sierra Vista Herald | The Bisbee Daily Review
MEXICO CITY — The mayor of Douglas, Ray Borane, was among the Arizona civic and business leaders who met with Mexican President Felipe Calderon at his residence on Friday.
Borane said Public Security Secretary Genaro Garcia told him and Gov. Janet Napolitano that Mexico’s federal government is planning to establish two law enforcement bases in Agua Prieta, Sonora, that will deal with border-related matters.
In addition, Garcia told Borane that the federal officers would not allow protesters to blockade the port of entry into Douglas as a tactic in political protests.
svherald.com /articles/2007/02/11/local_news/news4.txt   (457 words)

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